DNA purification and isolation using magnetic particles
First Claim
1. A method of reversibly binding DNA non-specifically to magnetic microparticles having a carboxyl group-coated surface, comprising the steps of:
- a) combining magnetic microparticles having a carboxyl group-coated surface to a solution containing DNA; and
b) adjusting the salt and polyethylene glycol concentration of the solution to a concentration suitable for binding the DNA onto the surfaces of the magnetic microparticles,thereby binding the DNA non-specifically to the magnetic microparticles.
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Accused Products
Abstract
A method of separating polynucleotides, such as DNA, RNA and PNA, from a solution containing polynucleotides by reversibly and non-specifically binding the polynucleotides to a solid surface, such as a magnetic microparticle, having a functional group-coated surface is disclosed. The salt and polyalkylene glycol concentration of the solution is adjusted to levels which result in polynucleotide binding to the magnetic microparticles. The magnetic microparticles with bound polynucleotides are separated from the solution and the polynucleotides are eluted from the magnetic microparticles.
484 Citations
29 Claims
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1. A method of reversibly binding DNA non-specifically to magnetic microparticles having a carboxyl group-coated surface, comprising the steps of:
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a) combining magnetic microparticles having a carboxyl group-coated surface to a solution containing DNA; and b) adjusting the salt and polyethylene glycol concentration of the solution to a concentration suitable for binding the DNA onto the surfaces of the magnetic microparticles, thereby binding the DNA non-specifically to the magnetic microparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 24)
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9. A method of separating DNA from a solution containing DNA, comprising the steps of:
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a) combining magnetic microparticles having carboxyl group-coated surfaces and a solution containing DNA, thereby producing a first combination; b) adjusting the salt concentration and the polyethylene glycol concentration of the first combination to concentrations suitable for binding DNA to surfaces of the magnetic microparticles, thereby producing a second combination comprising DNA bound non-specifically to magnetic microparticles; c) separating the magnetic microparticles from the second combination; d) contacting the magnetic microparticles separated in c) with the bound DNA in an elution buffer, whereby DNA is dissolved in the elution buffer and DNA bound from the magnetic microparticles is separated from the magnetic microparticles; and e) separating the magnetic microparticles from the elution buffer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of separating DNA from a solution containing DNA, comprising the steps of:
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a) combining a solution containing DNA and carboxyl group-coated magnetic micro-particles, thereby producing a first combination; b) combining the first combination with sufficient quantities of polyethylene glycol and sodium chloride to produce a second combination having a final polyethylene glycol concentration of from about 5% to about 15% and a final sodium chloride concentration of from about 0.5M to about 5.0M, whereby DNA in the solution binds nonspecifically to the magnetic microparticles, producing magnetic microparticles having DNA bound thereto; c) separating magnetic microparticles from the second combination, thereby producing separated magnetic microparticles having DNA bound thereto; d) contacting the separated magnetic microparticles having DNA bound thereto with an elution buffer, whereby the DNA is released from the magnetic microparticles and an elution buffer containing DNA and magnetic microparticles is produced; and e) separating DNA released from the magnetic microparticles from the elution buffer. - View Dependent Claims (20, 21, 22, 23)
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- 25. A kit comprising a binding buffer and magnetic microparticles with carboxyl group-coated surfaces, wherein the binding buffer comprises a suitable salt and a suitable polyethylene glycol at a concentration suitable for binding DNA to the surface of the magnetic microparticles.
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29. A method of isolating polynucleotides from a solution containing a mixture of biomolecules, comprising the steps of:
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a) combining a solution containing a mixture of biomolecules with carboxyl-coated magnetic microparticles; b) adjusting the polarity and the hydrophobicity of the resulting solution so as to adsorb polynucleotides onto the surface of the microparticles; c) separating the microparticles from the solution containing the biomolecules; d) combining the separated magnetic microparticles with a second solution whose polarity and hydrophobicity results in the polynucleotides being desorbed from the surface of the magnetic microparticle, and dissolved in the second solution; and e) separating the magnetic microparticles from the second solution.
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Specification